Mobile data stops working

When your data stops during a phone call on a Samsung Galaxy (including newer models like the S23/S24/S26 series), it is usually because the phone is dropping from 5G/4G to a 3G or 2G network to handle the voice call, which does not support simultaneous data. 

1. Enable VoLTE (Voice over LTE) 

This is the most common solution. VoLTE allows your phone to use the 4G/LTE/5G network for voice calls, which enables data to work simultaneously.

Go to Settings > Connections > Mobile networks. Toggle on VoLTE calls (or 4G calling / Voice over LTE).

2. Check Dual SIM Settings (If Applicable) 

If you are using two SIM cards, the phone may be using one SIM for calls and the other for data. If the call-receiving SIM does not have active data, it will cut out. 
Go to Settings > Connections > SIM manager.

Turn on Data switching and backup calling.

Alternatively, try to make calls using the same SIM that is assigned for mobile data. 

3. Reset Network Settings 

This resets your Wi-Fi, Bluetooth, and mobile network settings to default, fixing potential configuration errors. 

Go to Settings > General management > Reset.

Tap Reset network settings and confirm. 

4. Other Potential Solutions

Update Software: Ensure your phone is running the latest software, as updates can fix network connectivity issues.

Check Carrier Support: Contact your service provider to ensure VoLTE is enabled on your account, as some carriers require this on their end.

Restart Device: Simple reboots can re-establish proper connection to network towers.

At first i wasnt getting any of my txt but seems to have sorted itself out same with phone calls signal wasn't good

Same issue seems to be an issue with the 26s series. Out of curiousity what is your carrier? With vodafone and like you said data/wifi signal either drops or dosnt work - also same issue with calling as well, Guess they go hand in hand with each other. Hopefully samsung fix this issue on their end soon

The first part is normal sorta. From what you've explained, your VoLTE isn't working. So when you make a phone call, your phone swaps to 3g or 2g. That's what's killing your mobile data. VoLTE makes calls on 4g and 5g possible which keeps your mobile data working.

Depending on your carrier, the setting might not appear and be default on, so it not being there isn't exactly a problem. For me, I don't have a setting for it, but it's permanently on.

But it not working is indeed a problem

As others have stated, VoLTE is only available with a stable 4G/5G connection. Go to Settings>About phone>Status Information>SIM Card status to view your currently connected Mobile Voice Network.

My network is vodadone. Since notifications agent shown up to like responses in member app

My issue matches the topic but may differ slightly from other users.

Mobile data on my S26 Ultra (verizon US) will stall about two or three times a day while the status indicates that I have 4 bars or better 5GUW. It seems to stall indefinitely (a minute or more) if I do nothing. I can move to a browser window and confirm that there is no connection.

If switch to airplane mode, it takes about 15 seconds to confirm. Then when I turn off airplane mode, my mobile data has worked every time (about ten instances since I started this).

However, if I am on a call (even a data call such as MS Teams), I am not allowed to enter airplane mode, and I have to disconnect to use the reset process. I would love to know if anyone else is experiencing this.

Should I start a new discussion with this issue?